Compact megajoule-class pulsed power supply for generating long-pulsed magnetic fields.

Kazuki Matsui,Koichi Kindo,Yoshihiko Ihara,Tomoki Kanda,Yoshimitsu Kohama

doi:10.1063/5.0032895

Kazuki Matsui, Koichi Kindo + Show 3 more

Open Access

https://doi.org/10.1063/5.0032895

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Abstract

A pulsed power supply with a compact and low-cost electric-double-layer-capacitor (EDLC) is developed for generating pulsed magnetic fields with a long pulse duration of a few seconds. The system is demonstrated in three experimental setups using a 10.7 F- or 50 F-EDLC capacitor bank. By using the 10.7 F-EDLC capacitor bank with a 27 mm wide-bore magnet, the pulsed magnetic field with a peak field strength of 24.3 T and a pulse duration of ∼1 s is generated. The field profiles are reproduced in the theoretical calculations taking Joule heating into account. The calculations are also used to discuss possible variations of the field profile for future investigations.

Highlights

The controllable magnetic field variation is the basis of many modern technologies, including magnetic storage, maglev trains, and magnetic resonance imaging (MRI) in diagnostics
This paper reports the design of a mobile and low-cost pulse power supply based on an electric-double-layer-capacitor (EDLC)
The closing of Th2 reduces the current through the magnet and, thereby, results in the drops of the magnetic fields

Summary

INTRODUCTION

The controllable magnetic field variation is the basis of many modern technologies, including magnetic storage, maglev trains, and magnetic resonance imaging (MRI) in diagnostics. The superconducting magnet, the most practical way to generate strong magnetic fields, is not widely used in industry owing to its high cost and unwieldy size. The pulsed magnet can generate very high magnetic fields up to a few thousand Teslas with low electric energy, 2 but usually only for a short time. The long duration opens new applications of high magnetic fields, only a few selected facilities can generate a long pulse owing to the high construction cost and the unwieldy size of the flywheel motor generator. Using a 27 mm wide-bore pulsed magnet, we have generated pulsed magnetic fields of 24.3 T with pulse durations of ∼1 s To our knowledge, this is the first successful operation of an EDLC-based pulsed power supply for. Because of the low-cost and compact design, we believe that this system can be used in many research and industrial fields and may become an alternative to the superconducting magnet

ELECTRICAL CIRCUIT OF THE PULSED POWER SUPPLY

RESULTS

CONCLUSION